*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,body{
    width:100%;
    height: 100%;
    overflow-x: hidden;
    font-family: "微软雅黑";
    font-size:50px;
    margin:0;
    overflow-y:auto;
    -webkit-overflow-scrolling: touch;
    padding:0
}
.buy_btn{
    width: calc(100% - 40px);
    margin-left: 20px;
    height: 50px;
    font-size: 16px;
    line-height: 50px;
    text-align: center;
    background: #FF7D7D;
    color: white;
    border-radius: 10px;
    margin-top:10px;
}
.true_price{
    color: #FF7D7D;
    font-size: 18px;
}
.alert_price{
    text-align: right;
    font-size: 16px;
    color: #333333;
    margin-top: 20px;
    margin-right: 20px;
}
.course_price{
    margin-right: 20px;
    text-align: right;
}
.price_tip{
    color:#999999;
    font-size:12px;
}
.price{
    margin-top: 30px;
    font-size: 20px;
    color: #333333;
}
.pink_tip{
    color: #FF7D7D;
}
.left_bottom{
    font-size: 14px;
    color: #333333;
    margin-top: 20px;
}
.content_title{
    font-size: 18px;
    color: #FF7D7D;
}
.course_content{
    margin-left: 10px;
    margin-top: 10px;
}
.alert_content_box{
    margin-top:20px;
    width: calc(100% - 40px);
    margin-left: 20px;
    height: 85px;
    border-radius: 10px;
    background: #efefef;
    display: flex;
    justify-content: space-between;
}
.alert_title{
    font-size: 18px;
    margin-top:20px;
    margin-left:20px;
}
.one_year,.half_year,.one_month{
    width: 350px;
    margin-left: calc((100% - 350px) / 2);
    margin-top:10px;
    height:320px;
    position: relative;
}
.bg_img{
    width: 350px;
    position: absolute;
    top:0;
    left:0;
}

.icon{
    width:50px;
    position: absolute;
    bottom: 5px;
    left: calc((100% - 50px) / 2);
}
.alert_box{
    position: absolute;
    bottom:0;
    background: white;
    width: 100%;
    border-radius: 10px 10px 0 0;
    height: 275px;
    text-align: left;
    display: none;
}
.alert_bg{
    width: 100%;
    height: 100%;
    background: black;
    position: absolute;
    opacity: 0.5;
    top:0;
    display: none;
    left:0;
}
.original_price{
    position: absolute;
    color:white;
    top: 11px;
    right: 20px;
    font-size: 20px;
}
.discount_ios{
    position: absolute;
    color:white;
    opacity: 0.5;
    top:40px;
    right: 18px;
    font-size: 12px;
}
.discount_and{
    position: absolute;
    color:white;
    opacity: 0.5;
    top:40px;
    right: 18px;
    font-size: 12px;
}
